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Calculate the pH and percent ionization of a $0.80 \mathrm{M}$ $\mathrm{HNO}_{2}$ solution.

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$$2 \cdot 4 \%$$

Chemistry 102

Chapter 15

Acids and Bases

Liquids

University of Central Florida

University of Kentucky

Brown University

Lectures

03:07

A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, a liquid is one of the four fundamental states of matter (the others being solid, gas and plasma). A liquid is made up of tiny vibrating particles of matter, such as atoms, held together by intermolecular bonds. Water is, by far, the most common liquid on Earth. Like a gas, a liquid is able to flow and take the shape of a container. Most liquids resist compression, although others can be compressed. Unlike a gas, a liquid does not disperse to fill every space of a container, and maintains a fairly constant density. A distinctive property of the liquid state is surface tension, leading to wetting phenomena.

04:38

A liquid is a state of matter in which a substance changes its shape easily and takes the form of its container, and in which the substance retains a constant volume independent of pressure. As a result of this, a liquid does not maintain a definite shape, and its volume is variable. The characteristic properties of a liquid are surface tension, viscosity, and capillarity. The liquid state has a definite volume, but it also has a definite surface. The volume is uniform throughout the whole of the liquid. Solids have a fixed shape and a definite volume, but they do not have a definite surface. The volume of a solid does not vary, but the volume of a liquid may vary.

01:33

Calculate the $\mathrm{pH}…

07:17

Calculate $\left[\mathrm{O…

09:53

07:26

Calculate the hydronium io…

01:39

02:25

Find the pH and percent io…

04:36

Calculate $\left[\mathrm{H…

01:09

Calculate the pH of a solu…

01:37

Determine the [H3O+] and p…

we're going to be doing a percent ionization and pH calculation given concentration of an answer. The acid were given is nitrous acid H and 02 and were given a 0.80 Moeller solution. Nitrous acid is a weak acid, so it only partially associates. And when I look up a k a for this asset I get, let me see if I can find that here. 4.5 times 10 to the minus four. So now we have everything we need to figure this problem up. The first thing we're going to do is set up a nice table. That's step one. And there were going to put our values. Step two will be to put our values in the K equation after we have that. That will give us decay equation, which will give us our H plus concentration and then from R H plus concentration. We will calculate ph. So those are 1st 3 steps. Once we've done all that, we will figure out, um, since will know that concentration for our H plus an original concentration are third step will be to figure our percent ionization. Okay, so step one, you the ice Step two use the K equation to find H plus Step three his age plus plus to find ph and step for use the results remember to and divide by the given polarity Times 100 that'll give us a percent ionization. So let's go to the next page and begin first of all, our ice table. So we have a judge and 02 of course, a quiz and we're gonna have hpe plus and end old to minus. Okay, there's our equation so that I, c e and we were given 0.80 These regularities and our initial concentrations are zero. These are all Montel products. So this will increase by accessible decrease by X equilibrium. Concentrations will be 0.80 minus x X and X. Okay, Um, since our k A is so low, we're going to make the assumption that this is approximately equal to 0.80 We don't have to use the quadratic equation on this one, which is something if you've listened any my other problem solving I prefer doing okay and then r k expression for this will be of course, H plus, which is x no Tu minus, which is X. So begin the next squared and H and on to something our values in we have we're point by times 10 to the minus four equals X squared over 0.80 solving for X, I get equals 0.190 point 019 Moeller. Now that's my H plus in my n +02 concentration. Okay, so there's Step two. Step three, We're gonna take the negative log a 0.19 Moeller to get the pH. And we will get 1.72 and that is correct on sick things. And then step four. Last but not least, we're going to take our powers. Our concentration 0.19 Moeller divided by original or are starting polarity does the percent multiplied by 100 and we get 2.4%. All that

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